doesnt look like that light i posed will work. the halogen and xenon bulbs are 2500K and 2600K respectively. here's good info on "kelvin":
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Along with different wattages, different color spectra are available for metal halide bulbs. As is true with all bulbs, their color temperature is measured in degrees Kelvin (K). In simple terms, the higher the Kelvin rating, the bluer the bulb will appear. Since we are trying to meet the photosynthetic requirements of our corals, we want to give them the proper color spectrum to ensure their health and growth.
*Light Source Kelvin
Candle Flame 1800
Standard Incandescent Bulb 2500-3000
Warm White 3000
Cool White 4100
Daylight 6500
Noon Sunlight 5500
Overcast Sky 7000
Blue Sky 10000-20000+
*Color temperatures below 5500 Kelvin are not commonly used in reef aquariums.
When it comes to metal halide color spectrum, there is no one general rule of thumb, but some general observations can be made. Many hobbyists use metal halide bulbs with a Kelvin rating of 6500, and these bulbs produce a warm yellow/white appearance that simulates the midday sun on a shallow reef. Bulbs of this color are well suited for high light demanding corals and clams. While hobbyists report great success using these bulbs, they often complain of their yellow appearance when used without supplemental actinic light. Another common bulb is the 10000-Kelvin bulb, which produces a white appearance with a slight hint of blue. Although many hobbyists have also had good results using these bulbs over most types of corals, some have noticed that coral growth rates are somewhat slower than those using 6500-Kelvin bulbs. Gaining much wider acceptance and use lately is the 20000-Kelvin bulb, often called a Radium, which has a blue colored appearance. These bulbs are better suited for deeper water soft corals and LPS, although many hobbyists have also had success using them over clams and SPS.
I have personally used all of the above Kelvin bulbs with the following results:
The 6500 Kevin bulbs have given me the greatest coral growth in SPS, LPS placed lower in the tank and even soft corals. The color of the 6500-Kelvin bulbs when supplemented with actinic VHO tubes produces a crisp white appearance. For those seeking the greatest growth rates from SPS corals, I would recommend this color bulb.
The 10000-Kelvin bulbs also achieve good growth rates, albeit slower than the 6500-Kelvin bulbs. Their appearance is white with a slight blue tint when used with actinic supplementation. Bulbs of this color have produced excellent growth with soft corals and LPS in my own tanks along with slower paced SPS growth. I would recommend this bulb for a mixed reef environment.
The 20000-Kelvin bulb is very blue and brings out all of the fluorescent pigments in many corals. While they are visually appealing, the growth rate of my SPS corals came to a complete standstill while using them. I feel that these bulbs are well suited for a tank that simulates a deeper reef environment with LPS and soft corals but from my own experience, I do not feel that they are the best choice for high light SPS and clams. One note about the 20000-Kelvin lamps: in order to get the best intensity and color from these bulbs, they require a special HQI ballast for them to be driven as intended. This ballast is similar to the standard metal halide ballast, but includes a special starter to fire the lamp.
